| 1 | #ifndef COMBOOT_H |
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| 2 | #define COMBOOT_H |
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| 3 | |
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| 4 | /** |
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| 5 | * @file |
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| 6 | * |
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| 7 | * SYSLINUX COMBOOT |
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| 8 | */ |
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| 9 | |
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| 10 | FILE_LICENCE ( GPL2_OR_LATER ); |
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| 11 | |
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| 12 | #include <stdint.h> |
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| 13 | #include <setjmp.h> |
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| 14 | #include <gpxe/in.h> |
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| 15 | |
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| 16 | /** Segment used for COMBOOT PSP and image */ |
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| 17 | #define COMBOOT_PSP_SEG 0x07C0 |
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| 18 | |
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| 19 | /** Entry point address of COM32 images */ |
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| 20 | #define COM32_START_PHYS 0x101000 |
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| 21 | |
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| 22 | /** COM32 bounce buffer segment */ |
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| 23 | #define COM32_BOUNCE_SEG 0x07C0 |
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| 24 | |
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| 25 | /** Size of SYSLINUX file block in bytes */ |
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| 26 | #define COMBOOT_FILE_BLOCKSZ 512 |
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| 27 | |
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| 28 | /** COMBOOT feature flags (INT 22h AX=15h) */ |
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| 29 | #define COMBOOT_FEATURE_LOCAL_BOOT (1 << 0) |
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| 30 | #define COMBOOT_FEATURE_IDLE_LOOP (1 << 1) |
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| 31 | |
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| 32 | /** Maximum number of shuffle descriptors for |
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| 33 | * shuffle and boot functions |
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| 34 | * (INT 22h AX=0012h, 001Ah, 001Bh) |
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| 35 | */ |
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| 36 | #define COMBOOT_MAX_SHUFFLE_DESCRIPTORS 682 |
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| 37 | |
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| 38 | typedef union { |
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| 39 | uint32_t l; |
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| 40 | uint16_t w[2]; |
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| 41 | uint8_t b[4]; |
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| 42 | } com32_reg32_t; |
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| 43 | |
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| 44 | typedef struct { |
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| 45 | uint16_t gs; /* Offset 0 */ |
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| 46 | uint16_t fs; /* Offset 2 */ |
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| 47 | uint16_t es; /* Offset 4 */ |
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| 48 | uint16_t ds; /* Offset 6 */ |
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| 49 | |
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| 50 | com32_reg32_t edi; /* Offset 8 */ |
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| 51 | com32_reg32_t esi; /* Offset 12 */ |
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| 52 | com32_reg32_t ebp; /* Offset 16 */ |
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| 53 | com32_reg32_t _unused_esp; /* Offset 20 */ |
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| 54 | com32_reg32_t ebx; /* Offset 24 */ |
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| 55 | com32_reg32_t edx; /* Offset 28 */ |
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| 56 | com32_reg32_t ecx; /* Offset 32 */ |
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| 57 | com32_reg32_t eax; /* Offset 36 */ |
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| 58 | |
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| 59 | com32_reg32_t eflags; /* Offset 40 */ |
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| 60 | } com32sys_t; |
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| 61 | |
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| 62 | typedef struct { |
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| 63 | uint32_t eax; /* Offset 0 */ |
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| 64 | uint32_t ecx; /* Offset 4 */ |
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| 65 | uint32_t edx; /* Offset 8 */ |
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| 66 | uint32_t ebx; /* Offset 12 */ |
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| 67 | uint32_t esp; /* Offset 16 */ |
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| 68 | uint32_t ebp; /* Offset 20 */ |
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| 69 | uint32_t esi; /* Offset 24 */ |
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| 70 | uint32_t edi; /* Offset 28 */ |
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| 71 | |
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| 72 | uint32_t eip; /* Offset 32 */ |
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| 73 | } syslinux_pm_regs; |
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| 74 | |
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| 75 | typedef struct { |
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| 76 | uint16_t es; /* Offset 0 */ |
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| 77 | uint16_t _unused_cs; /* Offset 2 */ |
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| 78 | uint16_t ds; /* Offset 4 */ |
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| 79 | uint16_t ss; /* Offset 6 */ |
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| 80 | uint16_t fs; /* Offset 8 */ |
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| 81 | uint16_t gs; /* Offset 10 */ |
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| 82 | |
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| 83 | uint32_t eax; /* Offset 12 */ |
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| 84 | uint32_t ecx; /* Offset 16 */ |
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| 85 | uint32_t edx; /* Offset 20 */ |
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| 86 | uint32_t ebx; /* Offset 24 */ |
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| 87 | uint32_t esp; /* Offset 28 */ |
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| 88 | uint32_t ebp; /* Offset 32 */ |
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| 89 | uint32_t esi; /* Offset 36 */ |
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| 90 | uint32_t edi; /* Offset 40 */ |
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| 91 | |
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| 92 | uint16_t ip; /* Offset 44 */ |
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| 93 | uint16_t cs; /* Offset 46 */ |
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| 94 | } syslinux_rm_regs; |
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| 95 | |
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| 96 | typedef struct { |
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| 97 | uint32_t dest; |
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| 98 | uint32_t src; |
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| 99 | uint32_t len; |
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| 100 | } comboot_shuffle_descriptor; |
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| 101 | |
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| 102 | extern void hook_comboot_interrupts ( ); |
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| 103 | extern void unhook_comboot_interrupts ( ); |
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| 104 | |
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| 105 | /* These are not the correct prototypes, but it doens't matter, |
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| 106 | * as we only ever get the address of these functions; |
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| 107 | * they are only called from COM32 code running in PHYS_CODE |
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| 108 | */ |
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| 109 | extern void com32_intcall_wrapper ( ); |
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| 110 | extern void com32_farcall_wrapper ( ); |
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| 111 | extern void com32_cfarcall_wrapper ( ); |
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| 112 | |
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| 113 | /* Resolve a hostname to an (IPv4) address */ |
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| 114 | extern int comboot_resolv ( const char *name, struct in_addr *address ); |
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| 115 | |
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| 116 | /* setjmp/longjmp context buffer used to return after loading an image */ |
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| 117 | extern rmjmp_buf comboot_return; |
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| 118 | |
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| 119 | /* Replacement image when exiting with COMBOOT_EXIT_RUN_KERNEL */ |
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| 120 | extern struct image *comboot_replacement_image; |
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| 121 | |
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| 122 | extern void *com32_external_esp; |
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| 123 | |
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| 124 | #define COMBOOT_EXIT 1 |
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| 125 | #define COMBOOT_EXIT_RUN_KERNEL 2 |
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| 126 | #define COMBOOT_EXIT_COMMAND 3 |
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| 127 | |
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| 128 | extern void comboot_force_text_mode ( void ); |
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| 129 | |
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| 130 | #define COMBOOT_VIDEO_GRAPHICS 0x01 |
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| 131 | #define COMBOOT_VIDEO_NONSTANDARD 0x02 |
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| 132 | #define COMBOOT_VIDEO_VESA 0x04 |
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| 133 | #define COMBOOT_VIDEO_NOTEXT 0x08 |
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| 134 | |
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| 135 | #endif |
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